Alfred g



(No Model.) 2 sheets-sneet 1. A. G. HOLCMBE. DYNAMO ELECTRIC MACHINE.

Patented Jan. 6, 1891 if ,www

@any

(No Model.) 2 Sheets-Sheet 2.

A. G. HOLGOMBE.

DYNAMO ELECTRIC MACHINE.

No. 444,067. Patented Ja.11.6, 1891.

5 @vm/vbo@ www@ L1 Hoz wz n/a/ M,

UNITED 1STATES PATENT OFFICE.

ALFRED G. llOI.COMBE, OF LONG ISLAND CITY, ASSIGNOR OF ONE-HALF TOCHARLES L. BROIVNE, OF NEIV YORK, N. Y.

DYNAMO-ELECTRIC MACHlNE.

SPECtE-LCATION forming part of Letters Patent No. 44,067, dated January6, 1891.

Application filed September 17,1890. Serial No, 365,271. (No model.)

To all whom, t may concern:

Be it known that I, ALFRED G. lloLconBE, a citizen of the United States,residing at Long Island City, in the county of Kings and State 5 of NewYork, have invented certain new and useful Improvements inDynamo-Flectric Machinos, of which the following is a specilication.

Myinvention relates to dynamo-electric ma- 1o ehines of that class inwhich electric currents are generated by revolving electro-magneticpole-pieces without coils in proximity to fixed armaturecoils, theexciting or induced coils also being stationary.

I 5 The objects of my invention are to secure a compact, eilicient, andsimple machine which dispenses with moving wire, iron armaturecores, andin which lamination of the iron cores of the held-magnets isunnecessary, and

2o which cores are free from hysteresis.

The subject-matter of my improvements is hereinafter specified.

My improvements are more especially applicable to generators ofalternate currents,

2 5 but may also readily be adapted to continuous-current machines inwell-known ways.

In order to carry out my invention in the best way non" known to me, Imount the armature or induced coils in a circular series 3o in a fixedshell or ring-frame. The coils of the iieldnnagnets are also secured tothe fixed armature-traine, while the pole-pieces revolve in bearings indefinite relations to each other and to the armature-coils. Each seriesof polepieces lies on opposite sides of the armaturecoils, one seriesbeing of one polarity and the other of the opposite polarity, thefield-coils being divided into corresponding polarity.

In the accompanying drawings, which represent so much of my improvedmachine as is necessary to illustrate the subject-matter claimed, Figurel is a vertical section on the line 1 l of Fig. 2, which is acorresponding section on the line 2 2 of Fig. l, with some of the partsremoved. Fig. 3 is a diagram illustrating the armature-windingg Fig. 4,a view of the inner side of the skeleton armatureframe, the pole-pieces,and their connecting,r disk or spider on one side of the frame, and

Fig. 5, a section through the casing and arma- 5o ture-frame on the line5 5 of Fig. et.

Standards A on a bed-plate B are shown as provided with bearings a for ashaft O, carrying a driving-pulley D. The shaft O is of iron, with itsmiddle portion enlarged to constitute a core for the field-coils, andwith shoulders c, against which iron disks or spiders F, lined on theshaft, bear, thus holding the spiders parallel to each other a properdistance apart. 6o

ledge-shaped pole-pieces E are secured by screws or other suitable meansat uniform and suitable distances apart around the inner faces of eachdisk near itsperiphery and opposite each other, so as to leave a narrowspace between their inner ends to be occupied by the armature-coils.These pole-pieces are thus in magnetic circuit with the core-shaft O,with which both they and their carryingdisks or spiders F revolve. l 7cA cylindrical shell or annular casing N, secured to the bed-plate byfeet O on opposite sides of the standards A, is made of non-magneticmetal and of a width sufficient to overhang the spiders F, which closeits ends, but revolve freely therein without touching. A ring G, also ofnon-magnetic metal, is secured to the inner side of the casing N, aboutmidway of its length, and connected with a central diaphragm I, also ofnon-magnetic metal, So by plates or strips J, also of non-magneticmetal, arranged radially in the casing at suitable intervals, so as toconnect the diaphragm and ring, four being shown in the drawings, thusrigidly connecting' these parts. The dia- 8 5 phragm is also encircledby an annular flange projecting on each side of the web of thediaphragm. This flange, the strips J, and the ring are all shown as ofequal width.

The armature-coils K are interposed at suit- 9o able intervals betweenthe ring G and the flange of the diaphragm I and in the same verticalplane. Each coil is wound on a core IJ of non-magnetic insulatedmaterial, such as vulcanized liber, hard rubber, or porcelain. Theselined coils, like the movable pole-pieces, are arranged, at uniformintervals in a circular series and occupy a fixed position relativelythereto-that is to say,kthe number of coils is double that of thepole-pieces on one side of the machine; or, in other words, the coilsare as numerous as all the pole-pieces, and as the latter are arrangedin a double series, while the coils are all in the same plan e, eachpair of pole-pieces is always actuated or influenced by two coils. Thecoils may be connected in multiple or in series, but preferably inseries, as shown in Fig. 3. are held in position by annular orsectorshaped plates M, of non-magnetic material, secured by suitablefastenings to opposite sides of the diaphragm I, the ring Gr, and thecores L. These cores are wound vertically in planes parallel with thatof their supports, or, in other words, parallel with the plane in whichthe pole-pieces rotate. The latter, it will be observed, are shown asbeing made solid and carrying` no wire and rotating close to the coilsK, which have no iron in their cores.

The field-coils P are wound ona spool p, of non-magnetic metal, withinwhich the enlarged central portion of' the core-shaft C freely revolves.The ends ofthis spoolv are parallel with the diaphragm l, to which it-issecured near its middle, so asy to divide the field-coils `wound thereon.centrally into. two portions corresponding with their respectivepole-pieces, the organization being such that north polarity is inducedin all the pole-pieces E on one side of the armature-coilsL andopiposite polarity in the others. Currents for the fieldand armaturecoilspass through their respective binding-posts Qand R.

The ring G, diaphragm I, and plates J areall electrically connected,these plates being sovarranged that when opposing. pole-pieces areopposite one plate corresponding polepieces are opposite the otherplates, thus neutralizing by counter-currents the currents "generated bythe pole-pieces passing the plates.

The advantages and mode of operation of my improved machine will readilybe appreciated and understood by those skilled in the art withoutfurther description.

Having thus particularly describedthe construction and organization ofmy improved dynamo-electric machine, what I claim therein as new .and asof my own invention is l. The combination of the core-shaft, the spidersrevolving therewith, the oppositely and inwardly projecting pole-pieces,the inclosing shell, the ring secured on the inside thereof, the centraldiaphragm, radial strips connecting the diaphragm and ring, (the ring,

strips, and diaphragm all being of non-magnetic material,) the singleseries of armaturecoils interposed between the ring and diaphragm andwound parallel therewitharound cores of insulated non-magnetic material,the spool in which the core-shaft revolves secured to the diaphragm, andtheield-coils Wound They on' opposite ends of the spool and separated bythe diaphragm, the combination being and operating substantially ashereinbefore set forth.

2. The combination of the core-shaft, the spiders and pole-piecesrevolving therewith, theinclosing shell, the ring secured therein, thecentral diaphragm, radial strips connecting the diaphragm and ring, (thering, strips, and diaphragm all being of non-magnetic material,) and thesingle series of armature-coils interposed between the ring anddiaphragm and wound parallel therewith around cores of insulatednon-magnetic material, the combination being and operating substantiallyas hereinbefore set forth.

3. The combination ofthe core-shaft, the ring, the central diaphragm,radial strips connecting the diaphragm` and ring, (the ring,

strips, and diaphragm all being of non-mag.- netic material,)armature-coils interposed in a single series between the ring anddiaphragm and wound parallel therewith around lcores of insulatednon-magnetic material, and field-` coils wound on a spool divided by andsecured on the diaphragm, in which spool and diaphragm the core-shaftfreely revolves, the combination :being and operati-ng substantially ashereinbefore set forth.

4. The combination of the .core-shaft, the ringgthe'central diaphragm,the radial strips connecting Ythediaphragm and ring, (the ring,` strips,and diaphragm all being of non-magnetic material,) and lfield-coilswound on a spool vdivided by and secured on the diaphragm, in Whichfspool and diaphragm the core-shaft freely revolves, the-combinationbeing and operating substantially as hereinbefore set forth.

5. The combination of the ring, the central diaphragm, radial metallicstrips connecting the/diaphragm. and ring, andv stationaryarmature-coilsinterposed between the ring and diaphragm, the combination being andoperatingsubstantially as hereinbefore set forth.

6; The combination of the core-shaft, the diaphragm, .theV spool securedthereto in which the core-shaft revolves, and the'separate fieldcoilswound upon thespool on oppositesides of the diaphragm, the combinationbeing and operating substantially as hereinbefore set forth.

7. Thecombinationfot the diaphragm, the spool secured thereto, theseparate field-coils wound on opposite sides of the diaphragm, thecore-shaft revolving freely in the spool, spiders on opposite ends ofthe core-shaft at both ends of the spool, and inwardly-projectingpole-pieces without coils, carried by the spiders, the combinationbeing. and operatingsubstantially as hereinbefore set forth.`

8. The combination,'substantially as here- IOO inbefore set forth, ofthe ring, the diaphragm,

tion to the radial strips as always to aot uniformly upon chem toneutralize counter-ourrents therein.

9. In a dynamo-electric machine 0r eleetrie motor, the Combination ofthe armature-coils, the pole-pieces, and the radial met-allie stripsarranged equidst-ant around the circle of armature-coils and pole-piecesand connecting the inner and outer rings of the 'frame Within which J@hearmature-coils are mounted. Io

In testimony whereof I have hereunto subscribed my naine.

ALFRED G. HOLCOMBE. lVitnesses:

EDWARD C. DAVIDSON, LLOYD B. WIGHT.

